clc
//initialisation of variables
clear
r= 4
l1= 4 //units
l2= 10 //units
//CALCULATIONS
sxy= (4/r)
sxy1= l1^2
sxy2= l2^2
//RESULTS
printf ('x^2+4*y^2 = %.f ',sxy)
printf ('\n x^2+4*y^2 = %.f ',sxy1)
printf ('\n x^2+4*y^2 = %.f ',sxy2)